P0171 P0174 System too lean(Bank 1 and 2)

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May 29, 2013 | 11:50 PM

Gordon Gekko

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1st Gear

Joined: May 2013

Posts: 3

P0171 P0174 System too lean(Bank 1 and 2)

Got a 2007 A8 with 67K.
Recently replaced the MAS, it didn't help.
Probable causes?
Anyone knows how to check the O2 sensor?
Any suggestions?

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